645069 has 8 divisors (see below), whose sum is σ = 905440. Its totient is φ = 407376.

The previous prime is 645067. The next prime is 645077. The reversal of 645069 is 960546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 645069 - 2¹ = 645067 is a prime.

It is a super-2 number, since 2×645069² = 832228029522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5602 + ... + 5715.

It is an arithmetic number, because the mean of its divisors is an integer number (113180).

2⁶⁴⁵⁰⁶⁹ is an apocalyptic number.

It is an amenable number.

645069 is a deficient number, since it is larger than the sum of its proper divisors (260371).

645069 is a wasteful number, since it uses less digits than its factorization.

645069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11339.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 645069 is about 803.1618765853. The cubic root of 645069 is about 86.4043068412.

The spelling of 645069 in words is "six hundred forty-five thousand, sixty-nine".